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Salinity as a Determinant Structuring Microbial Communities in Coastal Lakes

The response of bacterioplankton structure to salinity level in coastal lakes (n = 9) along the southern Baltic Sea coastline was studied. In terms of mean salinity levels (0.2–5.2 PSU), the lakes represented freshwater, transitional, and brackish types. Results showed that salinity determines the s...

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Autores principales: Lew, Sylwia, Glińska-Lewczuk, Katarzyna, Burandt, Paweł, Kulesza, Klaudia, Kobus, Szymon, Obolewski, Krystian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9028135/
https://www.ncbi.nlm.nih.gov/pubmed/35457457
http://dx.doi.org/10.3390/ijerph19084592
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author Lew, Sylwia
Glińska-Lewczuk, Katarzyna
Burandt, Paweł
Kulesza, Klaudia
Kobus, Szymon
Obolewski, Krystian
author_facet Lew, Sylwia
Glińska-Lewczuk, Katarzyna
Burandt, Paweł
Kulesza, Klaudia
Kobus, Szymon
Obolewski, Krystian
author_sort Lew, Sylwia
collection PubMed
description The response of bacterioplankton structure to salinity level in coastal lakes (n = 9) along the southern Baltic Sea coastline was studied. In terms of mean salinity levels (0.2–5.2 PSU), the lakes represented freshwater, transitional, and brackish types. Results showed that salinity determines the spatial and seasonal distribution patterns of microorganisms in costal lakes. Increased salinity contributed to a significant decline in total bacterial numbers (TBN). The TBN was lowest in brackish lakes in autumn (4 × 10(6) cells/mL) and highest in freshwater lakes in summer (7.11 × 10(6) cells/mL). The groups of Proteobacteria are appropriate bioindicators in any classifications of coastal ecosystems, particularly at low-haline stress. Alpha- and Gamma- subclasses of Proteobacteria are identifiers for brackish habitats, while Betaproteobacteria, due to their intolerance to haline stress, prefer freshwater habitats. Counts of euryhaline Actinobacteria, the dominant group of bacterioplankton (31.8%), decreased significantly with increased salinity. Actinobacteria and Deltaproteobacteria were identifiers of transitional lakes. Cytophaga-Flavobacteria showed affinity with freshwater ecosystems, but this relation was not statistically significant (p > 0.05). The bacteria groups correlated with other physico-chemical parameters of water, such as oxygenation (Actinobacteria) or organic carbon (Betaproteobacteria, Deltaproteobacteria). The impact of hydrological connectivity and salt-water interference on the microbiota structure and biogeochemistry of coastal waters should be considered in the assessment of the ecological status of coastal lakes.
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spelling pubmed-90281352022-04-23 Salinity as a Determinant Structuring Microbial Communities in Coastal Lakes Lew, Sylwia Glińska-Lewczuk, Katarzyna Burandt, Paweł Kulesza, Klaudia Kobus, Szymon Obolewski, Krystian Int J Environ Res Public Health Article The response of bacterioplankton structure to salinity level in coastal lakes (n = 9) along the southern Baltic Sea coastline was studied. In terms of mean salinity levels (0.2–5.2 PSU), the lakes represented freshwater, transitional, and brackish types. Results showed that salinity determines the spatial and seasonal distribution patterns of microorganisms in costal lakes. Increased salinity contributed to a significant decline in total bacterial numbers (TBN). The TBN was lowest in brackish lakes in autumn (4 × 10(6) cells/mL) and highest in freshwater lakes in summer (7.11 × 10(6) cells/mL). The groups of Proteobacteria are appropriate bioindicators in any classifications of coastal ecosystems, particularly at low-haline stress. Alpha- and Gamma- subclasses of Proteobacteria are identifiers for brackish habitats, while Betaproteobacteria, due to their intolerance to haline stress, prefer freshwater habitats. Counts of euryhaline Actinobacteria, the dominant group of bacterioplankton (31.8%), decreased significantly with increased salinity. Actinobacteria and Deltaproteobacteria were identifiers of transitional lakes. Cytophaga-Flavobacteria showed affinity with freshwater ecosystems, but this relation was not statistically significant (p > 0.05). The bacteria groups correlated with other physico-chemical parameters of water, such as oxygenation (Actinobacteria) or organic carbon (Betaproteobacteria, Deltaproteobacteria). The impact of hydrological connectivity and salt-water interference on the microbiota structure and biogeochemistry of coastal waters should be considered in the assessment of the ecological status of coastal lakes. MDPI 2022-04-11 /pmc/articles/PMC9028135/ /pubmed/35457457 http://dx.doi.org/10.3390/ijerph19084592 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lew, Sylwia
Glińska-Lewczuk, Katarzyna
Burandt, Paweł
Kulesza, Klaudia
Kobus, Szymon
Obolewski, Krystian
Salinity as a Determinant Structuring Microbial Communities in Coastal Lakes
title Salinity as a Determinant Structuring Microbial Communities in Coastal Lakes
title_full Salinity as a Determinant Structuring Microbial Communities in Coastal Lakes
title_fullStr Salinity as a Determinant Structuring Microbial Communities in Coastal Lakes
title_full_unstemmed Salinity as a Determinant Structuring Microbial Communities in Coastal Lakes
title_short Salinity as a Determinant Structuring Microbial Communities in Coastal Lakes
title_sort salinity as a determinant structuring microbial communities in coastal lakes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9028135/
https://www.ncbi.nlm.nih.gov/pubmed/35457457
http://dx.doi.org/10.3390/ijerph19084592
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